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ER32 "UM"?

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sparky961:
I recently purchased a set of ER32 collets with an R8 collet chuck. I bought them because they were a good deal, even though my machine is MT3. The plan was to simply get an MT3 chuck on eBay and everyone would be happy.

Ok, here I am - unhappy.

What I ended up getting was an ER32 UM collet chuck. No, the other ones I have don't fit. Can anyone explain where I went wrong? I had always assumed there was only one kind of ER32. :-(

Swarfing:
Both nuts should fit on either collet holder as the thread etc is the same. The only difference should be whether you use a spanner or a castellated wrench to tighten it?

Arbalist:
Not heard of the "UM" designation. A quick google seems to indicate that it's just a balanced version of the nut for speeds up to 18000 rpm. My personal favourite is the bearing version of the nut as it's so much easier to tighten than the plain ones.

For your info the one I have is the "B" type half way down this page:

http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collet-Nuts-Wrenches-and-Spanners

Can you show us a picture of your chuck and collets?

DICKEYBIRD:
Ignore this if you're already familiar with how the ER collets fit into the offset seat in the nut.  You have to snap the collet into the nut before screwing it onto the chuck.

Many 1st time ER users make this error...including me a few years ago!  Again, my apologies if this is old news to you,

sparky961:

--- Quote from: DICKEYBIRD on November 22, 2014, 11:19:19 AM ---Ignore this if you're already familiar with how the ER collets fit into the offset seat in the nut.  You have to snap the collet into the nut before screwing it onto the chuck.

Many 1st time ER users make this error...including me a few years ago!  Again, my apologies if this is old news to you,

--- End quote ---

I sure would have appreciated this advice when it WAS my first time inserting a collet...   At the time it took me a while to figure it out. :)

Unfortunately that isn't the case right now.

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